Rotary ventilator



L. B. SHARPNACK.

RTARY VENTILATOR.

APPLICATION man MAY 26. ma.

Patented Aug.V 26, 1919.

'rum :nl umlux vLANouuAmc co,l WASHINGTON. u. f

LORD B. SHARPNACK, OF DETROIT, MICHIGAN.

ROTARY VENTILATOR.

Specification of Letters Patent.

Patented Aug. 26, 1919.

Application led May 26, 1919. Serial No. 299,847.

To all 'whom t 'may conce/rn Be it known that I, Lonn B. SIIARPNACK, a citizen of the United States of America, residing at Detroit, in the county of lVa-yne and State of Michigan, have invented certain new and useful Improvements in Rotary ventilators, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to ventilators, and has special reference to that type located in the open and automatically adjusted by air currents or transient wind to produce or increase, by aspiration, drafts within `the ventilator, so that a circulation of air may be maintained in a building or compartment thereof. Such ventilators are also employed in connection with the discharge of smoke, gases and vapors from buildings, and also from analogous structures.

The primary object of my invention is to provide a ventilator of the above type with a novel cowl or rotary casing in a portion of which a partial vacuum or suction may be produced to expeditiously remove air and other matter from the outlet connection of the ventilator.

Another object of my invention is to provide a ventilator wherein the movable parts are perfectly balanced and supported for operation with a minimum friction and possibility `of displacement.

A further object of my invention is to provide a ventilator wherein the parts are constructed with la view of reducing the cost i of manufacture and at the same time retain those features by which durability, simplicity of construction and ease of assembling are secured. Vith such ends in view, my invention resides in the novel construction to be hereinafter considered land then claimed.

Reference will now be had to the drawing,

Figure 1 is a vertical sectional View of the ventilator, partly in elevation;

Fig. 2 is a plan of the same, partly broken away and partly in section;

Fig. 3 is an enlarged detail sectional View of a cowl bearing, `and Fig. il is a vertical sectional view taken on the line I'V-IV of Fig. 2.

In the drawing, the reference numeral 1 denotes a vertically disposed cylindrical outlet connection and suitably secured to the upper end thereof is a plurality of uprights 2 having the upper. ends thereof bent inwardly and disposed at an angle, as at 3', so that a conical shaped hood 4 may be mounted on the upper ends of said uprights. The hood il is maintained in a spaced relation to the upper end of the outlet connection 1 and is of a greater diameter than said outlet connection so as to prevent rain from entering the outlet connection or falling on other elements of the ventilator.

The plurality of uprights 2 support superimposed eircular deflectors 5 and cope ate with the hood et in delecting air outwardly at all sides of the connection l, between the upper end of said connection and said hood.

The apex of the hood il is provided with a cap (Shaving a socket or fulcrum bearing 7 for theeenter ypiece 8 of a spider 9. The center piece S has a central pin or boss 10 extending into the socket 7 and a depending wall or apron 11 of said center piece prevents accidental lateral displacement of the spider relative to the hood. The spider 9 is preferably in the form of a plurality ofl angularly disposed arms preferably disposed in parallelism with the hood 11 and on the` lower ends of said arms is a cowl or rotary casing 12 which surrounds the upper end o f the outlet connection 1 in spaced relation thereto. To maintain this relation the inner wall of the cowl adjacent the lower end thereof, has a plurality of inwardly projecting bearings 13 for anti-frictiona-l wheels or rollers 11i that travel lin a channel track or member 15, carried by the outer' wall of the connection 1. It `is through the medium of these anti-frictional wheels and the fulcrurn of the spider. that the cowl may freely revolve relative to the outlet connection 1 and its hood 4.

Diametrically o-pposcd walls of the cowl 1Q are provided with inlet and outlet openings 16 and 17, the former admitting air to the cowl and the latter permitting air to exhaust therefrom. Both of these openings have side wings 1S and to maintain the openings in the wind or in alinement with a draft of the spider 9 is provided with a vane 19, which may be secured to one of the spider arms and connected to the cowl by side braces 20.

Projecting inwardly from the walls of the cowl 12 are brackets 21 supporting a somewhat circular or curved shell 22 which has its lower end surrounding the outlet connection 1 and its upper end extending into the hood 4. The shell 22 coperates with the cowl in providing a conduit 23 communicating with the air intake-opening- '16 so that air entering the cowl will be deflected at the shell 22 into the conduit 23, said conduit having its ends opening in proximity to the exhaust opening` 17 of lthe cowl. The inrush of air in the opening 16 and through the conduit 23 will produce Aa partial vacuumor suction beneath the hood 4 and at the upper end of the :outlet connectiona 1, so `that a draft ,will be produc-ed in the outlet connection l and any other conduits or connections therewith. The ventilator will therefore positively draw air from theoutlet connection l, especially when there is an air current or transient wind vin which` the ventilator yis maintained by the vane 19,.

To further deflect the air or gases emitted by the .outlet connection l and .prevent an. eddy in the top of the hood 4, said hood has a .central inverted conical shaped deflector 24 and air and gases impinging lagainst this defleetor are directed outwardly from bene-ath said hood. 'The draft produced `in the branches of the conduit 23 is -suliicient to quickly exhaust air from the upper end of the .outlet connection l, and the air will be deflected downwardly from under the cowl by the deflect-or 5 or outwardly through the eXhaus-t opening 17 thereof.

It is thought that :the operation and utility of the ventilator will beapp arent without further description, and while in the .drawing there is yillustrated the preferred embodiment ,of my invention, it is to be understood that the structural .elements are susceptible to such variations and modifications as fall within the `scope of the vappended claims.

l. A :Ventilator comprising an outlet connection, a hood above said connection, a cowl surrounding said hood .and supported thereby7 and a shell insaid cowl adapted lto produce a draft beneath said hood and a-t the upper Gnd of said outlet connection.

2. A ventilator as characterized in claim l, and wherein a spider having a central bearing on said hood supports said cowl.

3. A ventilator as characterized in `claim l, and wherein a series "of annular deilectors Copiesof this patent may be obtained for are supported between said outlet connection and said hood.

4. A ventilatorcomprising an outlet connection, Ia. hood above said outlet connection, a spider having a central fulcrum bearing on said hood, a cowl carried by said spider about said hood and adapted to produce `a .partial vacuum at said outlet connection.

5. A ventilator as characterized in claim 4, and wherein a track .and wheels brace the lower end of ,the cowl relative to the outlet connection.

6. A ventilator as characterized in .claim 4, and wherein defle'ctors .are :arranged between the outlet connection .andthe hood.

7. A ventilator comprising a .rotatable cowl having .air intake vand exhaust openings, and a shellsupported -in said cowl yproviding a .conduit open at its middle portion to `the air intake opening of said cowlA and having its `ends open at the .exhaust opening of said cowl and adapted to produce .a .suction centrally of said shell.

v8. A ventilator as characterized in claim 7, and wherein a central vbearing supportsithe upper end of the cowl, and wheels brace the lower end thereof.

9. A ventilator coinprisingan outlet connection, uprights ,carried -.thereby, a hood supported by said uprightsa fulcrum .bearing .on said hood, la spidersupported from said bearing, ,a cowl carried by said spider surrounding the .upper `end -of said outlet connection, ksaid cowl `lrawing air intake* and exhaust openings, a shell supported nsaid cowl and cooperating therewith in providing a conduit open .at its .middle `portion at .the air intake-opening .of said cowl and 4having its ends =open at the exhaust .opening-of said cowl, Iand means bracing the ilo-wer end of said cowl relative to said outlet connection.

10. A ventilator as `chanacterized in claim 9, and wherein ,a series ofdeflectors aresupported by said uprights between :said .outlet connection Aand said hood.

In `testimony whereof I affix ,my signature in the presence of two witnesses.

Loin) s. sHAnPNAcK,

Witnesses:

KARL H. BUTLER, ANNA M. Donn.

five cents each,by addressing .the Commissioner :of Patents, Washington, D. C. 

